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WARRANTY OBLIGATIONS - Summary of Warranty Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Changes in the Company's product warranty liability |  |  |  |  |
Warranty obligations, beginning of period | $ 59,938 | $ 37,907 | $ 45,913 | $ 37,098 |
Accruals for warranties issued during period | 4,780 | 1,939 | 11,993 | 4,229 |
Changes in estimates | 3,593 | 3,869 | 15,517 | 7,294 |
Settlements | (4,141) | (3,274) | (9,828) | (9,122) |
Increase due to accretion expense | 1,260 | 832 | 3,307 | 2,410 |
Other | 2,082 | 2,506 | 610 | 1,870 |
Warranty obligations, end of period | 67,512 | 43,779 | 67,512 | 43,779 |
Less: current portion | (16,728) | (10,760) | (16,728) | (10,760) | $ (11,260)
Noncurrent | $ 50,784 | $ 33,019 | $ 50,784 | $ 33,019 | $ 34,653

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